Blowpipe



Jan. 12 1926.

L. OLIPHANT BLOWPIPE Filed Feb.- 5,

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Patented Jan. 12, 1926.

UNITED STATES PATENT OFFICE.

LAURENCE OLIPHANT, OF TRENTON, NEW JERSEY, ASSIGNOR TO LENE COMPANY, A. CORPORATION OF WEST VIRGINIA.

ox'wnnn scurr- BLOWPIPE.

Application filed February a, 1922. Serial No. 533,988.

To all whom it may concern:

Be it mown that I, LAURENCE OnrrEANT, a citizen of the United States, reslding at Trenton, in the county of Mercer and State of New Jersey, have invented certain new and useful Improvementsin Blowpipes, of which th following is a specification.

This invention relates to blowplpes and particularly to an improved type of portable,

welding blowpipe for working metals.

In injector-type blowpipes as heretofore constructed, the throttling action occurs at a point behind the exit orifice of the lnjector nozzle and before the gas emerges from the injector, causing a slower speed of the et for certain adjustments. An important objectof the present invention is to provlde a blowpipe in which the throttling of the gas always occurs at the exit orifice of the injector nozzle so as to give the maximum injector action for any adjustment of the 1njector valve. J

Another object of the invention is to simplify the construction of the blovvpipeand to render it more conveniently operable close to the work. i

The above and other objects and the novel is a central longitudinal sectional view of the same; Fig. 3 is a detail cross-sectional View taken on the line 3-3 of Figurefl; and

Fig. 4 is an enlarged sectional view of the jector nozzle and parts associated therewith. j v Generally speaking, the improved blowpipe comprises a one-piece headI-I of brass or other suitable composition rigidly mounted on a handle A, the rear end of which comprises the valve body or casting K'that carries gas controlling valves and the usual hose couplings which are connected to the as supply devices. The blowpipe herein disclosed is particularly. adapted as aweldingblowpipe using two gases, such as oxygen'and acetylene, the oxygengas being'desirably supplied under a ressure of several pounds and the combustib e gas or acetylene being under a pressure of less than one pound, the two gases being mixed by an injector in the head H which utilizes the energy of the high pressure gas to create a suction vacuum to draw the low pressure gas into the mixingchamber and force the mixture from the tip of the blowpipe. The passage in the nozzle of the injector is adjustable in size so that it may be used with passage comprising a threaded socket portion 10' which communicates through a throat 11 with a flaring outlet portion 12 that is adapted to discharge directly into the tapering passage in the tip T, coupled to the I ower end of the head, as by screw threads 13. The complete blowpipe comprises a number of tips, similar to the tip T, but of different sizes for various classes of welding. The tips of the blowpipe are desirably of copper or other composition having the necessary heat resisting property. An injector nozzle N is adapted to be screwed into the threaded socket 10, bein desirably provided with a slot 14: arranged to take the end of a screwdriver whereby the nozzle may be fitted against the shoulder 15 in the socket. 16 therethrough that is axially in line with and adapted to discharge into the throat 11. The forward outer portion of the nozzle is tapered to providea combustible gas chamber C in the socket portion of the head pasdesirably The nozzle N has :a passage justing threads 18 cooperating with cone spending threads in the securing nut 19 that is screwed into and constitutes a closure for the outer end of the socket 10. Suitable packing 20 is held in place between the valve stern and the adjustingnut 19 by the collar 21, to prevent gas leakage, and the outer end of the stem is provided with means for turning or adjusting the same, such as the thumb wheel 22. By removing the nut 19, the en-.

tire valve assembly may be withdrawn as a unit forinspection or repairs. The threadthe throttling of the gas always occurs at the exit orifice of the injector nozzle.- The end of the needle valve that operates in the nozzle'has a tapered seating surface 24 that v is inclined more abruptly than the cooperatingseating surface in the nozzle passage,16,

so that the end of the needle valve at all times projects through the nozzle. Accordingly, in all positions of the needle valve the throttling of the gas passing through the nozzle takes place at the exit orifice of the nozzle and afiords the maximum injector action that is possible for any adjustment of the valve.

' The boss H has an oxygen passage 26 and a combustible gas or .acetylene passage 27 which, respectively, communicate with-the socket 10 behind the injector nozzle and with the chamber 0. Gas is supplied to the passages 26 and 27, respectively, ca

y arranged pipes 28. and '29 ch are soldered or otherwise rigidly secured to the boss H and extend through the handle shell '30 to the rear casting or valve body K, the pipe 29 being soldered to the collars'31 and 311 which carry the handle 30. The oxygen pipe 28 communicates with a passage 32 in the valve body .K that is controlled by a suitable valve 33 and the acetylene pipe 29 communicates with a passage 34 that is controlled by a valve 35. The valves fit into internally threaded bosses on the body K and may, be provided with suitable operating handles 331, 351. Heretofore, the lower valve 35 has been disposed so as to project pelt'ipendicularly downwardly from the valve ha y K and, when the blowpipe is in use,

. interferes with operations close to the work.

Inthe improvedblowpi e herein disclosed the valve 35 and the ban le 351 thereof project laterally from a perpendicular plane through the blowpipe and are disposed above the horizontal plane that includes the lowest parts at the opposite ends of the blowpipe, whereby the handle does not interfere with the operation of the blowpipe close to the work.

The manipulation of the blowpipewill be readily understood from the drawings and.

the foregoing description. Briefly, after the valves 33 and 35 have-been adjusted to adwit the desired flow of oxygen and acetylene,

byl concentriw 1 further adjustment of the valve V adjusts the oxygen jet issuing from the injector nozzle in accordance with the size of welding tip T that is employed. The acetylene or combustible gas carried into the mixing passages by entrainment is indirectly varied by adjusting the needle valve V. While the improved blowpipe is shown and described in detail, it will be understood that various changes may be made therein without departing from the spirit of the invention.

I claim:

1. In a blowpipe, head having a gas passage comprising a socket and a throat, an injectornozzle in said socket having a tapering passage therethrough arranged to discharge into said throat and providing a chamber adjacent the entrance of said throat, said head having a combustiblegas duct opening into said chamber and an oxyge'n duct opening into said socket behind said nozzle, a tapering needle valve disposed in said nozzle passage and having its seating surface more abruptly inclined than the cooperating seat in said nozzle passage, and a nut havin threads coupling it to said head and to sai valve.

2. In a blow ipe, the combination of a one-piece head aving a gas passage comprising a socket and a throat, an injector nozzle having threads securing it in said socket and having a tapering oxygen passage therethrough with its exit orifice spaced from but arranged to discharge into said throat, saidnozzle providing :.a combustible gas chamber adjacent the entrance of said throat, a tapering needle valve having its seating surfabe more abruptly inclined than the cooperating seat in said nozzle passage and projecting through said nozzle passage at all times whereby the throttling of t e 7 gas always occurs at the exit orifice of said nozzle and a nut having threads coupling it to said head and to said valve and constituting a,closurefor said socket.

3. In a blowpipe, the combination of a head having means at one end for securing a tip thereto, a threaded socket at its other end terminating atan' interior shoulder in said head, a chamber in front of said shoulder, and a gas passage leading from said chamber to said tip; an injector nozzle having threads cooperating with the threads of said socketand also having a the combination of a screw driver slot at its rear end whereby 7 said nozzle may be removably secured in said socket, said nozzle projecting into said cham- I her and adapted to discharge into said gas passage; said head having passages for leading gases to said socket be ind said injector and to said chamber; a valve controlling the flow of gas through said nozzle; and a nut having threads removably coupling it to said head and other threads adjustably supporting said valve, said nut constituting a closure for said socket and adapted to remove said Valve therewith from said head.

4. In a blow pipe, the combination of a head having means at one end for securing a tip thereto, an internally threaded socket at the other end of said head terminating at an interior shoulder in said head, a chamber in front of said shoulder, and a gas passage leading from said chamber to said tip; an injector nozzle having threads cooperating with the threads of said socket behind said shoulder and also having a screw driver slot at its rear end whereby said nozzle may be removably secured in said socket against said shoulder, said nozzle projecting into said chamber and adapted to discharge into said gas passage; said head having a boss on its rear side provided with ducts for leading oxygen and combustible gas respectively to said socket behind said injector nozzle and to said chamber; a needle valve controlling the flow of gas through said nozzle; and a. nut having threads removably coupling it to said head and other threads adjustably supporting said valve,

said nut constituting a closure for sa d socket and adapted to remove said valve therewith from said head to render said nozzle easily accessible for inspection or removal.

5. In a blowpipe, the combination of a.

head having a socket therein provided with a threaded portion of uniform diameter and a gas passage leading from said socket through said head, a threaded injector nozzle fitting the thread of said socket, arranged to discharge into said gas passage and providing a chamber adjacent the entrance of said passage, said head having gas ducts opening into said chamber and into said socket behind said nozzle, a valve con,- trolling the flow of gas through said nozzle, and a nut having a thread fitting said socket thread to couple it to said head and a central threaded portion cooperating with said valve, said nut constituting a closure for said socket and adapted to remove said valve therewith from said head.

In testimony whereof, I aflix my signature.

LAURENCE OLIPHANT. 

